浏览器版本获取

public class Handler : IHttpHandler {        public void ProcessRequest (HttpContext context) {        context.Response.ContentType = "image/JPEG";        using (System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(300, 300))        {            using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap))            {                 g.DrawString("IP："+context.Request.UserHostAddress,new System.Drawing.Font("宋体",20),System.Drawing.Brushes.Red,0,0);                 g.DrawString("操作系统为："+context.Request.Browser.Platform,new System.Drawing.Font("宋体",20),System.Drawing.Brushes.Pink,0,50);                 g.DrawString("浏览器的版本号为：" + context.Request.Browser.Type, new System.Drawing.Font("宋体", 13), System.Drawing.Brushes.Pink, 0, 100);                 g.DrawString("浏览器的版本号为：" + context.Request.Browser.Version, new System.Drawing.Font("宋体", 13), System.Drawing.Brushes.Pink, 0, 150);                 bitmap.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);            }         }    }